化学改性蓖麻籽壳粉对天然硫化橡胶力学性能的影响

IF 4.9 Q2 NANOSCIENCE & NANOTECHNOLOGY

Nanotechnology, Science and Applications Pub Date : 2021-12-30 DOI:10.33425/2639-9466.1028

Tenebe O.G, Madufor I.C, Obidiegwu M.U, O. H.C

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引用次数: 0

摘要

对改性蓖麻籽壳粉填充天然橡胶的力学性能进行了研究。取蓖麻籽壳，用20% NaOH处理1h，在75℃下洗涤干燥，粉碎筛分至75μm。处理后的蓖麻籽壳粉在pH、容重、含水量、木质素含量、纤维素含量、半纤维素含量、热稳定性、SEM和FTIR光谱等方面均优于未处理的蓖麻籽壳粉。天然橡胶在两辊轧机上以0、10、20、30、40和50phr不同的填料负荷进行复合。用Mosanto流变仪(型号MDR 2000)测定了复合橡胶的硫化特性，并将所得结果用于液压机的硫化。分析了硫化胶的硫化特性、力学性能和形态性能，并与炭黑填充样品进行了比较。初步结果表明，蓖麻籽壳具有亲水性，经化学处理降低了其亲水性。最大和最小扭矩随着填料载荷的增加而增加。结果表明，天然橡胶填充的硫化胶的力学性能得到改善，如:拉伸强度、模量、撕裂强度、硬度、耐磨性随填料用量的增加而增加，而断裂伸长率、弯曲疲劳伸长率、压缩凝固率、冲击强度和回弹回弹率随填料用量的增加而降低。与UCSS和CB填充的硫化胶相比，TCSS填充的硫化胶具有更好的耐磨性和压缩性。30phr下的样品形貌表明，与界面相互作用较差的UCSS相比，TCSS具有良好的分散性，这是由于填料和基体之间具有很强的界面附着力，从而改善了所研究的力学性能。结果表明，TCSS是一种具有一定工程应用价值的补强填料，可用于生产天然橡胶基产品。

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Effect of Chemically Modified Castor Seed (Ricinus Communis) Shell Powder on The Mechanical Properties of Natural Rubber Vulcanizate

Mechanical properties of natural rubber filled with modified castor seed shell powder for some engineering applications were studied. Castor seed shells were obtained and treated with 20% NaOH for 1h, washed and dried at 75oC and were pulverized and sieved to 75μm. Treated castor seed shell (TCSS) powder showed improved characteristics when compared to the untreated (UCSS) in terms of pH, bulk density, moisture content, lignin content, cellulose content, hemicelluloses content, thermal stability, SEM and FTIR spectra respectively. Natural rubber was compounded at varying filler loadings of 0, 10, 20, 30, 40 and 50phr on a two-roll mill. The cure characteristics of the compounded rubber were determined using a Mosanto Rheometer (model MDR 2000) and the result obtained were used for vulcanization in a hydraulic press. The cure characteristics, mechanical and morphological properties of the vulcanizates were analysed and compared with carbon black filled samples. The preliminary results showed that castor seed shell is hydrophilic which was chemically treated to decrease the hydrophilicity. The maximum and minimum torques increased with filler loadings. The result of the natural rubber filled vulcanizates showed improved mechanical properties such as; tensile strength, modulus, tear strength, hardness, abrasion resistance which increased with increased filler loadings while elongation at break, flex fatigue, compression set, impact strength and rebound resilience decreased with filler loadings. The TCSS filled vulcanizate showed superior abrasion resistance and compression set when compared with UCSS and CB filled. The sample morphology at 30phr revealed that TCSS was well dispersed due to strong interfacial adhesion between the filler and the matrices contributing to the improved mechanical properties investigated when compared to UCSS filled with poor interfacial interaction. The result reveal that TCSS is a reinforcing filler that can be used for the production of natural rubber-based products for some engineering applications.

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来源期刊

Nanotechnology, Science and Applications NANOSCIENCE & NANOTECHNOLOGY-

CiteScore

11.70

自引率

0.00%

发文量

审稿时长

16 weeks

期刊介绍： Nanotechnology, Science and Applications is an international, peer-reviewed, Open Access journal that focuses on the science of nanotechnology in a wide range of industrial and academic applications. The journal is characterized by the rapid reporting of reviews, original research, and application studies across all sectors, including engineering, optics, bio-medicine, cosmetics, textiles, resource sustainability and science. Applied research into nano-materials, particles, nano-structures and fabrication, diagnostics and analytics, drug delivery and toxicology constitute the primary direction of the journal.